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tedster - 4:22 am on Mar 16, 2012 (gmt 0)
[edited by: tedster at 1:44 pm (utc) on Mar 16, 2012]
Rustybrick over at SERoundtable pinged Google about these ranking shifts. reference [seroundtable.com] His report: "Google told me there is no Panda update happening right now. Nor is there a data refresh."
So this is not a Panda-related change.